Add crudes to the blend

To specify a blend, you must provide a list of constituent crudes, together with their weight or volume proportions in the final mixture.

Click the Add button at the bottom of the Blending page to add one or more crudes to the blend list. The Select Crudes dialog opens. See Select crudes.

Another way to add a blend constituent is to double click on any empty area of the Blending page.

You can also add multiple items at a time from the database into the blend crude list by copying and pasting:

1. Select the crudes you want to add in the database window.

2. Press Ctrl + C or click the Copy button in the Clipboard group of the Home ribbon tab.

3. Do either of the following:

• Click Paste in the Clipboard group of the Home ribbon tab.

• Right click in the blend crudes list and select Paste from the context menu.

Once you have added a crude, you can edit it in the following ways:

• To replace the crude, double click either the Reference or the Name cell. The Select Crudes dialog opens, allowing you to choose another crude.

• Change the ratio of the crude in the blend by double clicking the value in the Ratio column and typing a new value. The ratio determines the proportion, by either weight or volume, of the crude in the final blend mixture. For example, a mixture of Arab Light, Kirkuk Blend and Basrah Light in the ratio 1:2:3 gives a blend that is one sixth Arab Light, one third Kirkuk Blend, and one half Basrah Light. The values in the % Wgt and % Vol columns, showing the equivalent percentages of the crude by weight and by volume, are updated automatically when you change the ratio.

  Tip: It is also possible to select assays for blending from the Database module. Select the required assays, right click and choose Create Blend from the context menu. Alternatively, click Create Blend in the Database group of the Home ribbon tab. This will copy the selected assays to the Blend module replacing any assays that are currently selected.

Weight or Volume option

The start ratios may either be in weight or volume proportions. To switch between these two options, choose the appropriate option from the Blend Using drop-down menu at the bottom of the page.

Negative Coefficients

Assay allows you to reverse the operation of blending by subtracting out one or more known blend constituents from a given blend. This is accomplished by specifying negative ratio weightings for the constituents being factored out of the blend.

Managing the list

You may add items to the blend crude list, edit items in the list and remove items from the list in a number of ways:

• Right click on the crude list and choose Add, Edit or Remove from the menu.

• Add a blend item by double clicking in the white space below the current list of crudes in the blend.

• Click the Add, Edit and Remove buttons at the bottom of the Blending page.

Copying and pasting data

You can copy and paste crudes in the crude list to other crude lists in Assay, or to other programs using cutting, copying and pasting functionality. This can be accessed in a number of ways:

• Click the Cut, Copy and Paste buttons in the Clipboard group of the Home ribbon tab for cut, copy and paste respectively.

• Right click on the crude list and choose Cut, Copy and Paste from the context menu.

• Use the keyboard shortcuts Ctrl + X, Ctrl + C and Ctrl + V

Copying an item will place a copy of the information associated with that crude item onto the Clipboard, from where it can be pasted into other crude lists, or into an external application, such as Microsoft® Excel®. Conversely, data formatted in a recognisable way may be pasted from external programs into the Assay crude lists. Cutting an item copies it to the Clipboard, before permanently removing it from the crude list.